Adding exp once baddy killed

[iSlayer]

Well no matter how much I try I can't seem to get this script working! First the baddies join monster_base with their attributes set, then

PHP Code:

public function onNPCHit(itemID, damage, range, attacker, effects, type, pos) {
  if(!this.hit) {
    this.hit = true;

    x = x; // Stop movement

    this.hp += damage;

    if(this.hp <= 0) {
      hide();
      sleep(6);
      show();
      Respawn();
    }

    this.hit = false;
  }

  ShowHP();
} 


I've tried everything in this thread but have had no luck, can someone just post a simple script, not 3 or 4 scripts which will make my baddy work!